blob: 29432a50be45373cfcdc12f1c8368f965bd14024 [file] [log] [blame]
Thomas Sujithcc0573b2008-01-25 11:45:44 +08001/*
2 * intel_menlow.c - Intel menlow Driver for thermal management extension
3 *
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
6 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 * This driver creates the sys I/F for programming the sensors.
25 * It also implements the driver for intel menlow memory controller (hardware
26 * id is INT0002) which makes use of the platform specific ACPI methods
27 * to get/set bandwidth.
28 */
29
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/init.h>
33#include <linux/types.h>
34#include <linux/pci.h>
35#include <linux/pm.h>
36
37#include <linux/thermal.h>
38#include <acpi/acpi_bus.h>
39#include <acpi/acpi_drivers.h>
40
41MODULE_AUTHOR("Thomas Sujith");
42MODULE_AUTHOR("Zhang Rui");
43MODULE_DESCRIPTION("Intel Menlow platform specific driver");
44MODULE_LICENSE("GPL");
45
46/*
47 * Memory controller device control
48 */
49
50#define MEMORY_GET_BANDWIDTH "GTHS"
51#define MEMORY_SET_BANDWIDTH "STHS"
52#define MEMORY_ARG_CUR_BANDWIDTH 1
53#define MEMORY_ARG_MAX_BANDWIDTH 0
54
Thomas, Sujithd65dcdc2008-11-05 16:15:13 +053055/*
56 * GTHS returning 'n' would mean that [0,n-1] states are supported
57 * In that case max_cstate would be n-1
58 * GTHS returning '0' would mean that no bandwidth control states are supported
59 */
Matthew Garrett6503e5d2008-11-27 17:48:13 +000060static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
61 unsigned long *max_state)
Thomas Sujithcc0573b2008-01-25 11:45:44 +080062{
63 struct acpi_device *device = cdev->devdata;
64 acpi_handle handle = device->handle;
Matthew Wilcox27663c52008-10-10 02:22:59 -040065 unsigned long long value;
Thomas Sujithcc0573b2008-01-25 11:45:44 +080066 struct acpi_object_list arg_list;
67 union acpi_object arg;
68 acpi_status status = AE_OK;
69
70 arg_list.count = 1;
71 arg_list.pointer = &arg;
72 arg.type = ACPI_TYPE_INTEGER;
73 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
74 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
75 &arg_list, &value);
76 if (ACPI_FAILURE(status))
77 return -EFAULT;
78
Zhang Ruic2d06fe2008-09-11 10:56:00 +080079 if (!value)
80 return -EINVAL;
81
Thomas Sujithcc0573b2008-01-25 11:45:44 +080082 *max_state = value - 1;
83 return 0;
84}
85
Thomas Sujithcc0573b2008-01-25 11:45:44 +080086static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
Matthew Garrett6503e5d2008-11-27 17:48:13 +000087 unsigned long *value)
Thomas Sujithcc0573b2008-01-25 11:45:44 +080088{
89 struct acpi_device *device = cdev->devdata;
90 acpi_handle handle = device->handle;
Matthew Garrett6503e5d2008-11-27 17:48:13 +000091 unsigned long long result;
Thomas Sujithcc0573b2008-01-25 11:45:44 +080092 struct acpi_object_list arg_list;
93 union acpi_object arg;
94 acpi_status status = AE_OK;
95
96 arg_list.count = 1;
97 arg_list.pointer = &arg;
98 arg.type = ACPI_TYPE_INTEGER;
99 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
100 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000101 &arg_list, &result);
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800102 if (ACPI_FAILURE(status))
103 return -EFAULT;
104
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000105 *value = result;
106 return 0;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800107}
108
109static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000110 unsigned long state)
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800111{
112 struct acpi_device *device = cdev->devdata;
113 acpi_handle handle = device->handle;
114 struct acpi_object_list arg_list;
115 union acpi_object arg;
116 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400117 unsigned long long temp;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800118 unsigned long max_state;
119
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000120 if (memory_get_max_bandwidth(cdev, &max_state))
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800121 return -EFAULT;
122
Zhang Ruic2d06fe2008-09-11 10:56:00 +0800123 if (state > max_state)
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800124 return -EINVAL;
125
126 arg_list.count = 1;
127 arg_list.pointer = &arg;
128 arg.type = ACPI_TYPE_INTEGER;
129 arg.integer.value = state;
130
131 status =
132 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
Matthew Wilcox27663c52008-10-10 02:22:59 -0400133 &temp);
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800134
135 printk(KERN_INFO
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000136 "Bandwidth value was %ld: status is %d\n", state, status);
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800137 if (ACPI_FAILURE(status))
138 return -EFAULT;
139
140 return 0;
141}
142
143static struct thermal_cooling_device_ops memory_cooling_ops = {
144 .get_max_state = memory_get_max_bandwidth,
145 .get_cur_state = memory_get_cur_bandwidth,
146 .set_cur_state = memory_set_cur_bandwidth,
147};
148
149/*
150 * Memory Device Management
151 */
152static int intel_menlow_memory_add(struct acpi_device *device)
153{
154 int result = -ENODEV;
155 acpi_status status = AE_OK;
156 acpi_handle dummy;
157 struct thermal_cooling_device *cdev;
158
159 if (!device)
160 return -EINVAL;
161
162 status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
163 if (ACPI_FAILURE(status))
164 goto end;
165
166 status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
167 if (ACPI_FAILURE(status))
168 goto end;
169
170 cdev = thermal_cooling_device_register("Memory controller", device,
171 &memory_cooling_ops);
Thomas Sujith69f6b8d2008-02-15 01:05:23 -0500172 if (IS_ERR(cdev)) {
173 result = PTR_ERR(cdev);
174 goto end;
175 }
176
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700177 device->driver_data = cdev;
Julia Lawall3a8ca952008-04-29 00:59:30 -0700178 result = sysfs_create_link(&device->dev.kobj,
179 &cdev->device.kobj, "thermal_cooling");
180 if (result)
181 goto unregister;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800182
Julia Lawall3a8ca952008-04-29 00:59:30 -0700183 result = sysfs_create_link(&cdev->device.kobj,
184 &device->dev.kobj, "device");
185 if (result) {
186 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
187 goto unregister;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800188 }
189
190 end:
191 return result;
192
193 unregister:
194 thermal_cooling_device_unregister(cdev);
195 return result;
196
197}
198
199static int intel_menlow_memory_remove(struct acpi_device *device, int type)
200{
201 struct thermal_cooling_device *cdev = acpi_driver_data(device);
202
203 if (!device || !cdev)
204 return -EINVAL;
205
206 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
207 sysfs_remove_link(&cdev->device.kobj, "device");
208 thermal_cooling_device_unregister(cdev);
209
210 return 0;
211}
212
Tobias Klauserf7e8dd52008-04-21 22:28:49 +0000213static const struct acpi_device_id intel_menlow_memory_ids[] = {
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800214 {"INT0002", 0},
215 {"", 0},
216};
217
218static struct acpi_driver intel_menlow_memory_driver = {
219 .name = "intel_menlow_thermal_control",
220 .ids = intel_menlow_memory_ids,
221 .ops = {
222 .add = intel_menlow_memory_add,
223 .remove = intel_menlow_memory_remove,
224 },
225};
226
227/*
228 * Sensor control on menlow platform
229 */
230
231#define THERMAL_AUX0 0
232#define THERMAL_AUX1 1
233#define GET_AUX0 "GAX0"
234#define GET_AUX1 "GAX1"
235#define SET_AUX0 "SAX0"
236#define SET_AUX1 "SAX1"
237
238struct intel_menlow_attribute {
239 struct device_attribute attr;
240 struct device *device;
241 acpi_handle handle;
242 struct list_head node;
243};
244
245static LIST_HEAD(intel_menlow_attr_list);
246static DEFINE_MUTEX(intel_menlow_attr_lock);
247
248/*
249 * sensor_get_auxtrip - get the current auxtrip value from sensor
250 * @name: Thermalzone name
251 * @auxtype : AUX0/AUX1
252 * @buf: syfs buffer
253 */
Matthew Wilcox27663c52008-10-10 02:22:59 -0400254static int sensor_get_auxtrip(acpi_handle handle, int index,
255 unsigned long long *value)
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800256{
257 acpi_status status;
258
259 if ((index != 0 && index != 1) || !value)
260 return -EINVAL;
261
262 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
Matthew Wilcox27663c52008-10-10 02:22:59 -0400263 NULL, value);
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800264 if (ACPI_FAILURE(status))
265 return -EIO;
266
267 return 0;
268}
269
270/*
271 * sensor_set_auxtrip - set the new auxtrip value to sensor
272 * @name: Thermalzone name
273 * @auxtype : AUX0/AUX1
274 * @buf: syfs buffer
275 */
276static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
277{
278 acpi_status status;
279 union acpi_object arg = {
280 ACPI_TYPE_INTEGER
281 };
282 struct acpi_object_list args = {
283 1, &arg
284 };
Matthew Wilcox27663c52008-10-10 02:22:59 -0400285 unsigned long long temp;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800286
287 if (index != 0 && index != 1)
288 return -EINVAL;
289
290 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
Matthew Wilcox27663c52008-10-10 02:22:59 -0400291 NULL, &temp);
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800292 if (ACPI_FAILURE(status))
293 return -EIO;
294 if ((index && value < temp) || (!index && value > temp))
295 return -EINVAL;
296
297 arg.integer.value = value;
298 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
Matthew Wilcox27663c52008-10-10 02:22:59 -0400299 &args, &temp);
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800300 if (ACPI_FAILURE(status))
301 return -EIO;
302
303 /* do we need to check the return value of SAX0/SAX1 ? */
304
305 return 0;
306}
307
308#define to_intel_menlow_attr(_attr) \
309 container_of(_attr, struct intel_menlow_attribute, attr)
310
311static ssize_t aux0_show(struct device *dev,
312 struct device_attribute *dev_attr, char *buf)
313{
314 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
Matthew Wilcox27663c52008-10-10 02:22:59 -0400315 unsigned long long value;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800316 int result;
317
318 result = sensor_get_auxtrip(attr->handle, 0, &value);
319
320 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
321}
322
323static ssize_t aux1_show(struct device *dev,
324 struct device_attribute *dev_attr, char *buf)
325{
326 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
Matthew Wilcox27663c52008-10-10 02:22:59 -0400327 unsigned long long value;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800328 int result;
329
330 result = sensor_get_auxtrip(attr->handle, 1, &value);
331
332 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
333}
334
335static ssize_t aux0_store(struct device *dev,
336 struct device_attribute *dev_attr,
337 const char *buf, size_t count)
338{
339 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
340 int value;
341 int result;
342
343 /*Sanity check; should be a positive integer */
344 if (!sscanf(buf, "%d", &value))
345 return -EINVAL;
346
347 if (value < 0)
348 return -EINVAL;
349
350 result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
351 return result ? result : count;
352}
353
354static ssize_t aux1_store(struct device *dev,
355 struct device_attribute *dev_attr,
356 const char *buf, size_t count)
357{
358 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
359 int value;
360 int result;
361
362 /*Sanity check; should be a positive integer */
363 if (!sscanf(buf, "%d", &value))
364 return -EINVAL;
365
366 if (value < 0)
367 return -EINVAL;
368
369 result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
370 return result ? result : count;
371}
372
373/* BIOS can enable/disable the thermal user application in dabney platform */
374#define BIOS_ENABLED "\\_TZ.GSTS"
375static ssize_t bios_enabled_show(struct device *dev,
376 struct device_attribute *attr, char *buf)
377{
378 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400379 unsigned long long bios_enabled;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800380
381 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
382 if (ACPI_FAILURE(status))
383 return -ENODEV;
384
385 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
386}
387
388static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
389 void *store, struct device *dev,
390 acpi_handle handle)
391{
392 struct intel_menlow_attribute *attr;
393 int result;
394
395 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
396 if (!attr)
397 return -ENOMEM;
398
399 attr->attr.attr.name = name;
400 attr->attr.attr.mode = mode;
401 attr->attr.show = show;
402 attr->attr.store = store;
403 attr->device = dev;
404 attr->handle = handle;
405
406 result = device_create_file(dev, &attr->attr);
407 if (result)
408 return result;
409
410 mutex_lock(&intel_menlow_attr_lock);
411 list_add_tail(&attr->node, &intel_menlow_attr_list);
412 mutex_unlock(&intel_menlow_attr_lock);
413
414 return 0;
415}
416
417static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
418 void *context, void **rv)
419{
420 acpi_status status;
421 acpi_handle dummy;
422 struct thermal_zone_device *thermal;
423 int result;
424
425 result = acpi_bus_get_private_data(handle, (void **)&thermal);
426 if (result)
427 return 0;
428
429 /* _TZ must have the AUX0/1 methods */
430 status = acpi_get_handle(handle, GET_AUX0, &dummy);
431 if (ACPI_FAILURE(status))
432 goto not_found;
433
434 status = acpi_get_handle(handle, SET_AUX0, &dummy);
435 if (ACPI_FAILURE(status))
436 goto not_found;
437
438 result = intel_menlow_add_one_attribute("aux0", 0644,
439 aux0_show, aux0_store,
440 &thermal->device, handle);
441 if (result)
442 return AE_ERROR;
443
444 status = acpi_get_handle(handle, GET_AUX1, &dummy);
445 if (ACPI_FAILURE(status))
446 goto not_found;
447
448 status = acpi_get_handle(handle, SET_AUX1, &dummy);
449 if (ACPI_FAILURE(status))
450 goto not_found;
451
452 result = intel_menlow_add_one_attribute("aux1", 0644,
453 aux1_show, aux1_store,
454 &thermal->device, handle);
455 if (result)
456 return AE_ERROR;
457
458 /*
459 * create the "dabney_enabled" attribute which means the user app
460 * should be loaded or not
461 */
462
463 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
464 bios_enabled_show, NULL,
465 &thermal->device, handle);
466 if (result)
467 return AE_ERROR;
468
469 not_found:
470 if (status == AE_NOT_FOUND)
471 return AE_OK;
472 else
473 return status;
474}
475
476static void intel_menlow_unregister_sensor(void)
477{
478 struct intel_menlow_attribute *pos, *next;
479
480 mutex_lock(&intel_menlow_attr_lock);
481 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
482 list_del(&pos->node);
483 device_remove_file(pos->device, &pos->attr);
484 kfree(pos);
485 }
486 mutex_unlock(&intel_menlow_attr_lock);
487
488 return;
489}
490
491static int __init intel_menlow_module_init(void)
492{
493 int result = -ENODEV;
494 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400495 unsigned long long enable;
Thomas Sujithcc0573b2008-01-25 11:45:44 +0800496
497 if (acpi_disabled)
498 return result;
499
500 /* Looking for the \_TZ.GSTS method */
501 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
502 if (ACPI_FAILURE(status) || !enable)
503 return -ENODEV;
504
505 /* Looking for ACPI device MEM0 with hardware id INT0002 */
506 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
507 if (result)
508 return result;
509
510 /* Looking for sensors in each ACPI thermal zone */
511 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
512 ACPI_UINT32_MAX,
513 intel_menlow_register_sensor, NULL, NULL);
514 if (ACPI_FAILURE(status))
515 return -ENODEV;
516
517 return 0;
518}
519
520static void __exit intel_menlow_module_exit(void)
521{
522 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
523 intel_menlow_unregister_sensor();
524}
525
526module_init(intel_menlow_module_init);
527module_exit(intel_menlow_module_exit);